- show IPv4Address.None = "None"
- show addr = concat [(show oct1) ++ ".",
- (show oct2) ++ ".",
- (show oct3) ++ ".",
- (show oct4)]
- where
- oct1 = (octet1 addr)
- oct2 = (octet2 addr)
- oct3 = (octet3 addr)
- oct4 = (octet4 addr)
-
-
--- We don't export our constructor so this function is the only
--- way to construct an address from octets. As a result, we can
--- return IPv4Address.None in response to being passed one of more
--- Octet.None octets.
-ipv4address_from_octets :: Octet -> Octet -> Octet -> Octet -> IPv4Address
-ipv4address_from_octets oct1 oct2 oct3 oct4
- | or [oct1 == Octet.None,
- oct2 == Octet.None,
- oct3 == Octet.None,
- oct4 == Octet.None] = IPv4Address.None
- | otherwise = IPv4Address oct1 oct2 oct3 oct4
-
-
-min_address :: IPv4Address -> Maskbits -> IPv4Address
-min_address IPv4Address.None _ = IPv4Address.None
-min_address _ Maskbits.None = IPv4Address.None
-min_address addr mask
- | mask == ThirtyTwo = IPv4Address oct1 oct2 oct3 oct4
- | mask == ThirtyOne = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 a29 a30 a31 B.Zero)
- | mask == Thirty = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 a29 a30 B.Zero B.Zero)
- | mask == TwentyNine = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 a29 B.Zero B.Zero B.Zero)
- | mask == TwentyEight = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 B.Zero B.Zero B.Zero B.Zero)
- | mask == TwentySeven = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 B.Zero B.Zero B.Zero B.Zero B.Zero)
- | mask == TwentySix = IPv4Address oct1 oct2 oct3 (Octet a25 a26 B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero)
- | mask == TwentyFive = IPv4Address oct1 oct2 oct3 (Octet a25 B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero)
- | mask == TwentyFour = IPv4Address oct1 oct2 oct3 (min_octet)
- | mask == TwentyThree = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 a21 a22 a23 B.Zero) (min_octet)
- | mask == TwentyTwo = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 a21 a22 B.Zero B.Zero) (min_octet)
- | mask == TwentyOne = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 a21 B.Zero B.Zero B.Zero) (min_octet)
- | mask == Twenty = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 B.Zero B.Zero B.Zero B.Zero) (min_octet)
- | mask == Nineteen = IPv4Address oct1 oct2 (Octet a17 a18 a19 B.Zero B.Zero B.Zero B.Zero B.Zero) (min_octet)
- | mask == Eighteen = IPv4Address oct1 oct2 (Octet a17 a18 B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero) (min_octet)
- | mask == Seventeen = IPv4Address oct1 oct2 (Octet a17 B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero) (min_octet)
- | mask == Sixteen = IPv4Address oct1 oct2 (min_octet) (min_octet)
- | mask == Fifteen = IPv4Address oct1 (Octet a9 a10 a11 a12 a13 a14 a15 B.Zero) (min_octet) (min_octet)
- | mask == Fourteen = IPv4Address oct1 (Octet a9 a10 a11 a12 a13 a14 B.Zero B.Zero) (min_octet) (min_octet)
- | mask == Thirteen = IPv4Address oct1 (Octet a9 a10 a11 a12 a13 B.Zero B.Zero B.Zero) (min_octet) (min_octet)
- | mask == Twelve = IPv4Address oct1 (Octet a9 a10 a11 a12 B.Zero B.Zero B.Zero B.Zero) (min_octet) (min_octet)
- | mask == Eleven = IPv4Address oct1 (Octet a9 a10 a11 B.Zero B.Zero B.Zero B.Zero B.Zero) (min_octet) (min_octet)
- | mask == Ten = IPv4Address oct1 (Octet a9 a10 B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero) (min_octet) (min_octet)
- | mask == Nine = IPv4Address oct1 (Octet a9 B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero) (min_octet) (min_octet)
- | mask == Eight = IPv4Address oct1 (min_octet) (min_octet) (min_octet)
- | mask == Seven = IPv4Address (Octet a1 a2 a3 a4 a5 a6 a7 B.Zero) (min_octet) (min_octet) (min_octet)
- | mask == Six = IPv4Address (Octet a1 a2 a3 a4 a5 a6 B.Zero B.Zero) (min_octet) (min_octet) (min_octet)
- | mask == Five = IPv4Address (Octet a1 a2 a3 a4 a5 B.Zero B.Zero B.Zero) (min_octet) (min_octet) (min_octet)
- | mask == Four = IPv4Address (Octet a1 a2 a3 a4 B.Zero B.Zero B.Zero B.Zero) (min_octet) (min_octet) (min_octet)
- | mask == Three = IPv4Address (Octet a1 a2 a3 B.Zero B.Zero B.Zero B.Zero B.Zero) (min_octet) (min_octet) (min_octet)
- | mask == Two = IPv4Address (Octet a1 a2 B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero) (min_octet) (min_octet) (min_octet)
- | mask == One = IPv4Address (Octet a1 B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero B.Zero) (min_octet) (min_octet) (min_octet)
- | mask == Zero = IPv4Address (min_octet) (min_octet) (min_octet) (min_octet)
- | otherwise = addr
- where
- a1 = (b1 oct1)
- a2 = (b2 oct1)
- a3 = (b3 oct1)
- a4 = (b4 oct1)
- a5 = (b5 oct1)
- a6 = (b6 oct1)
- a7 = (b7 oct1)
- a9 = (b1 oct2)
- a10 = (b2 oct2)
- a11 = (b3 oct2)
- a12 = (b4 oct2)
- a13 = (b5 oct2)
- a14 = (b6 oct2)
- a15 = (b7 oct2)
- a17 = (b1 oct3)
- a18 = (b2 oct3)
- a19 = (b3 oct3)
- a20 = (b4 oct3)
- a21 = (b5 oct3)
- a22 = (b6 oct3)
- a23 = (b7 oct3)
- a25 = (b1 oct4)
- a26 = (b2 oct4)
- a27 = (b3 oct4)
- a28 = (b4 oct4)
- a29 = (b5 oct4)
- a30 = (b6 oct4)
- a31 = (b7 oct4)
- oct1 = (octet1 addr)
- oct2 = (octet2 addr)
- oct3 = (octet3 addr)
- oct4 = (octet4 addr)
-
-
-
-max_address :: IPv4Address -> Maskbits -> IPv4Address
-max_address IPv4Address.None _ = IPv4Address.None
-max_address _ Maskbits.None = IPv4Address.None
-max_address addr mask
- | mask == ThirtyTwo = IPv4Address oct1 oct2 oct3 oct4
- | mask == ThirtyOne = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 a29 a30 a31 B.One)
- | mask == Thirty = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 a29 a30 B.One B.One)
- | mask == TwentyNine = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 a29 B.One B.One B.One)
- | mask == TwentyEight = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 a28 B.One B.One B.One B.One)
- | mask == TwentySeven = IPv4Address oct1 oct2 oct3 (Octet a25 a26 a27 B.One B.One B.One B.One B.One)
- | mask == TwentySix = IPv4Address oct1 oct2 oct3 (Octet a25 a26 B.One B.One B.One B.One B.One B.One)
- | mask == TwentyFive = IPv4Address oct1 oct2 oct3 (Octet a25 B.One B.One B.One B.One B.One B.One B.One)
- | mask == TwentyFour = IPv4Address oct1 oct2 oct3 (max_octet)
- | mask == TwentyThree = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 a21 a22 a23 B.One) (max_octet)
- | mask == TwentyTwo = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 a21 a22 B.One B.One) (max_octet)
- | mask == TwentyOne = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 a21 B.One B.One B.One) (max_octet)
- | mask == Twenty = IPv4Address oct1 oct2 (Octet a17 a18 a19 a20 B.One B.One B.One B.One) (max_octet)
- | mask == Nineteen = IPv4Address oct1 oct2 (Octet a17 a18 a19 B.One B.One B.One B.One B.One) (max_octet)
- | mask == Eighteen = IPv4Address oct1 oct2 (Octet a17 a18 B.One B.One B.One B.One B.One B.One) (max_octet)
- | mask == Seventeen = IPv4Address oct1 oct2 (Octet a17 B.One B.One B.One B.One B.One B.One B.One) (max_octet)
- | mask == Sixteen = IPv4Address oct1 oct2 (max_octet) (max_octet)
- | mask == Fifteen = IPv4Address oct1 (Octet a9 a10 a11 a12 a13 a14 a15 B.One) (max_octet) (max_octet)
- | mask == Fourteen = IPv4Address oct1 (Octet a9 a10 a11 a12 a13 a14 B.One B.One) (max_octet) (max_octet)
- | mask == Thirteen = IPv4Address oct1 (Octet a9 a10 a11 a12 a13 B.One B.One B.One) (max_octet) (max_octet)
- | mask == Twelve = IPv4Address oct1 (Octet a9 a10 a11 a12 B.One B.One B.One B.One) (max_octet) (max_octet)
- | mask == Eleven = IPv4Address oct1 (Octet a9 a10 a11 B.One B.One B.One B.One B.One) (max_octet) (max_octet)
- | mask == Ten = IPv4Address oct1 (Octet a9 a10 B.One B.One B.One B.One B.One B.One) (max_octet) (max_octet)
- | mask == Nine = IPv4Address oct1 (Octet a9 B.One B.One B.One B.One B.One B.One B.One) (max_octet) (max_octet)
- | mask == Eight = IPv4Address oct1 (max_octet) (max_octet) (max_octet)
- | mask == Seven = IPv4Address (Octet a1 a2 a3 a4 a5 a6 a7 B.One) (max_octet) (max_octet) (max_octet)
- | mask == Six = IPv4Address (Octet a1 a2 a3 a4 a5 a6 B.One B.One) (max_octet) (max_octet) (max_octet)
- | mask == Five = IPv4Address (Octet a1 a2 a3 a4 a5 B.One B.One B.One) (max_octet) (max_octet) (max_octet)
- | mask == Four = IPv4Address (Octet a1 a2 a3 a4 B.One B.One B.One B.One) (max_octet) (max_octet) (max_octet)
- | mask == Three = IPv4Address (Octet a1 a2 a3 B.One B.One B.One B.One B.One) (max_octet) (max_octet) (max_octet)
- | mask == Two = IPv4Address (Octet a1 a2 B.One B.One B.One B.One B.One B.One) (max_octet) (max_octet) (max_octet)
- | mask == One = IPv4Address (Octet a1 B.One B.One B.One B.One B.One B.One B.One) (max_octet) (max_octet) (max_octet)
- | mask == Zero = IPv4Address (max_octet) (max_octet) (max_octet) (max_octet)
- | otherwise = addr
- where
- a1 = (b1 oct1)
- a2 = (b2 oct1)
- a3 = (b3 oct1)
- a4 = (b4 oct1)
- a5 = (b5 oct1)
- a6 = (b6 oct1)
- a7 = (b7 oct1)
- a9 = (b1 oct2)
- a10 = (b2 oct2)
- a11 = (b3 oct2)
- a12 = (b4 oct2)
- a13 = (b5 oct2)
- a14 = (b6 oct2)
- a15 = (b7 oct2)
- a17 = (b1 oct3)
- a18 = (b2 oct3)
- a19 = (b3 oct3)
- a20 = (b4 oct3)
- a21 = (b5 oct3)
- a22 = (b6 oct3)
- a23 = (b7 oct3)
- a25 = (b1 oct4)
- a26 = (b2 oct4)
- a27 = (b3 oct4)
- a28 = (b4 oct4)
- a29 = (b5 oct4)
- a30 = (b6 oct4)
- a31 = (b7 oct4)
- oct1 = (octet1 addr)
- oct2 = (octet2 addr)
- oct3 = (octet3 addr)
- oct4 = (octet4 addr)
-
-
-
-min_octet1 :: IPv4Address -> Maskbits -> Octet
-min_octet1 addr mask = octet1 (min_address addr mask)
-
-min_octet2 :: IPv4Address -> Maskbits -> Octet
-min_octet2 addr mask = octet2 (min_address addr mask)
-
-min_octet3 :: IPv4Address -> Maskbits -> Octet
-min_octet3 addr mask = octet3 (min_address addr mask)
-
-min_octet4 :: IPv4Address -> Maskbits -> Octet
-min_octet4 addr mask = octet4 (min_address addr mask)
-
-max_octet1 :: IPv4Address -> Maskbits -> Octet
-max_octet1 addr mask = octet1 (max_address addr mask)
-
-max_octet2 :: IPv4Address -> Maskbits -> Octet
-max_octet2 addr mask = octet2 (max_address addr mask)
-
-max_octet3 :: IPv4Address -> Maskbits -> Octet
-max_octet3 addr mask = octet3 (max_address addr mask)
-
-max_octet4 :: IPv4Address -> Maskbits -> Octet
-max_octet4 addr mask = octet4 (max_address addr mask)
+ show addr = concat [(show oct1) ++ ".",
+ (show oct2) ++ ".",
+ (show oct3) ++ ".",
+ (show oct4)]
+ where
+ oct1 = (octet1 addr)
+ oct2 = (octet2 addr)
+ oct3 = (octet3 addr)
+ oct4 = (octet4 addr)
+
+
+instance Arbitrary IPv4Address where
+ arbitrary = do
+ oct1 <- arbitrary :: Gen Octet
+ oct2 <- arbitrary :: Gen Octet
+ oct3 <- arbitrary :: Gen Octet
+ oct4 <- arbitrary :: Gen Octet
+ return (IPv4Address oct1 oct2 oct3 oct4)
+
+
+
+instance Maskable IPv4Address where
+
+ apply_mask addr mask bit =
+ apply_mask' mask
+ where
+ oct1 = octet1 addr
+ oct2 = octet2 addr
+ oct3 = octet3 addr
+ oct4 = octet4 addr
+
+ -- A copy of 'addr' with the fourth octet zeroed (or oned).
+ new_addr1 = addr { octet4 = (apply_mask oct4 Zero bit) }
+
+ -- Likewise for new_addr1's third octet.
+ new_addr2 = new_addr1 { octet3 = (apply_mask oct3 Zero bit) }
+
+ -- And new_addr2's second octet.
+ new_addr3 = new_addr2 { octet2 = (apply_mask oct2 Zero bit) }
+
+ -- This helper function allows us to pattern-match cleanly.
+ apply_mask' :: Maskbits -> IPv4Address
+
+ apply_mask' ThirtyTwo = addr
+
+ apply_mask' ThirtyOne = addr { octet4 = (apply_mask oct4 Seven bit) }
+
+ apply_mask' Thirty =
+ addr { octet4 = (apply_mask oct4 Six bit) }
+
+ apply_mask' TwentyNine =
+ addr { octet4 = (apply_mask oct4 Five bit) }
+
+ apply_mask' TwentyEight =
+ addr { octet4 = (apply_mask oct4 Four bit) }
+
+ apply_mask' TwentySeven =
+ addr { octet4 = (apply_mask oct4 Three bit) }
+
+ apply_mask' TwentySix =
+ addr { octet4 = (apply_mask oct4 Two bit) }
+
+ apply_mask' TwentyFive =
+ addr { octet4 = (apply_mask oct4 One bit) }
+
+ apply_mask' TwentyFour = new_addr1
+
+ apply_mask' TwentyThree =
+ new_addr1 { octet3 = (apply_mask oct3 Seven bit) }
+
+ apply_mask' TwentyTwo =
+ new_addr1 { octet3 = (apply_mask oct3 Six bit) }
+
+ apply_mask' TwentyOne =
+ new_addr1 { octet3 = (apply_mask oct3 Five bit) }
+
+ apply_mask' Twenty =
+ new_addr1 { octet3 = (apply_mask oct3 Four bit) }
+
+ apply_mask' Nineteen =
+ new_addr1 { octet3 = (apply_mask oct3 Three bit) }
+
+ apply_mask' Eighteen =
+ new_addr1 { octet3 = (apply_mask oct3 Two bit) }
+
+ apply_mask' Seventeen =
+ new_addr1 { octet3 = (apply_mask oct3 One bit) }
+
+ apply_mask' Sixteen =
+ new_addr2
+
+ apply_mask' Fifteen =
+ new_addr2 { octet2 = (apply_mask oct2 Seven bit) }
+
+ apply_mask' Fourteen =
+ new_addr2 { octet2 = (apply_mask oct2 Six bit) }
+
+ apply_mask' Thirteen =
+ new_addr2 { octet2 = (apply_mask oct2 Five bit) }
+
+ apply_mask' Twelve =
+ new_addr2 { octet2 = (apply_mask oct2 Four bit) }
+
+ apply_mask' Eleven =
+ new_addr2 { octet2 = (apply_mask oct2 Three bit) }
+
+ apply_mask' Ten =
+ new_addr2 { octet2 = (apply_mask oct2 Two bit) }
+
+ apply_mask' Nine =
+ new_addr2 { octet2 = (apply_mask oct2 One bit) }
+
+ apply_mask' Eight =
+ new_addr3 { octet2 = (apply_mask oct2 Zero bit) }
+
+ apply_mask' Seven =
+ new_addr3 { octet1 = (apply_mask oct1 Seven bit) }
+
+ apply_mask' Six =
+ new_addr3 { octet1 = (apply_mask oct1 Six bit) }
+
+ apply_mask' Five =
+ new_addr3 { octet1 = (apply_mask oct1 Five bit) }
+
+ apply_mask' Four =
+ new_addr3 { octet1 = (apply_mask oct1 Four bit) }
+
+ apply_mask' Three =
+ new_addr3 { octet1 = (apply_mask oct1 Three bit) }
+
+ apply_mask' Two =
+ new_addr3 { octet1 = (apply_mask oct1 Two bit) }
+
+ apply_mask' One =
+ new_addr3 { octet1 = (apply_mask oct1 One bit) }
+
+ apply_mask' Zero =
+ new_addr3 { octet1 = (apply_mask oct1 Zero bit) }
+
+
+
+-- | The minimum possible IPv4 address, 0.0.0.0.
+min_address :: IPv4Address
+min_address =
+ IPv4Address min_octet min_octet min_octet min_octet
+
+
+-- | The maximum possible IPv4 address, 255.255.255.255.
+max_address :: IPv4Address
+max_address =
+ IPv4Address max_octet max_octet max_octet max_octet
+
+
+-- | Given two addresses, find the number of the most significant bit
+-- where they differ. If the addresses are the same, return
+-- Maskbits.Zero.
+most_sig_bit_different :: IPv4Address -> IPv4Address -> Maskbits
+most_sig_bit_different addr1 addr2
+ | addr1 == addr2 = Maskbits.Zero
+ | m1 /= n1 = Maskbits.One
+ | m2 /= n2 = Two
+ | m3 /= n3 = Three
+ | m4 /= n4 = Four
+ | m5 /= n5 = Five
+ | m6 /= n6 = Six
+ | m7 /= n7 = Seven
+ | m8 /= n8 = Eight
+ | m9 /= n9 = Nine
+ | m10 /= n10 = Ten
+ | m11 /= n11 = Eleven
+ | m12 /= n12 = Twelve
+ | m13 /= n13 = Thirteen
+ | m14 /= n14 = Fourteen
+ | m15 /= n15 = Fifteen
+ | m16 /= n16 = Sixteen
+ | m17 /= n17 = Seventeen
+ | m18 /= n18 = Eighteen
+ | m19 /= n19 = Nineteen
+ | m20 /= n20 = Twenty
+ | m21 /= n21 = TwentyOne
+ | m22 /= n22 = TwentyTwo
+ | m23 /= n23 = TwentyThree
+ | m24 /= n24 = TwentyFour
+ | m25 /= n25 = TwentyFive
+ | m26 /= n26 = TwentySix
+ | m27 /= n27 = TwentySeven
+ | m28 /= n28 = TwentyEight
+ | m29 /= n29 = TwentyNine
+ | m30 /= n30 = Thirty
+ | m31 /= n31 = ThirtyOne
+ | m32 /= n32 = ThirtyTwo
+ | otherwise = Maskbits.Zero
+ where
+ m1 = (b1 oct1a)
+ m2 = (b2 oct1a)
+ m3 = (b3 oct1a)
+ m4 = (b4 oct1a)
+ m5 = (b5 oct1a)
+ m6 = (b6 oct1a)
+ m7 = (b7 oct1a)
+ m8 = (b8 oct1a)
+ m9 = (b1 oct2a)
+ m10 = (b2 oct2a)
+ m11 = (b3 oct2a)
+ m12 = (b4 oct2a)
+ m13 = (b5 oct2a)
+ m14 = (b6 oct2a)
+ m15 = (b7 oct2a)
+ m16 = (b8 oct2a)
+ m17 = (b1 oct3a)
+ m18 = (b2 oct3a)
+ m19 = (b3 oct3a)
+ m20 = (b4 oct3a)
+ m21 = (b5 oct3a)
+ m22 = (b6 oct3a)
+ m23 = (b7 oct3a)
+ m24 = (b8 oct3a)
+ m25 = (b1 oct4a)
+ m26 = (b2 oct4a)
+ m27 = (b3 oct4a)
+ m28 = (b4 oct4a)
+ m29 = (b5 oct4a)
+ m30 = (b6 oct4a)
+ m31 = (b7 oct4a)
+ m32 = (b8 oct4a)
+ oct1a = (octet1 addr1)
+ oct2a = (octet2 addr1)
+ oct3a = (octet3 addr1)
+ oct4a = (octet4 addr1)
+ n1 = (b1 oct1b)
+ n2 = (b2 oct1b)
+ n3 = (b3 oct1b)
+ n4 = (b4 oct1b)
+ n5 = (b5 oct1b)
+ n6 = (b6 oct1b)
+ n7 = (b7 oct1b)
+ n8 = (b8 oct1b)
+ n9 = (b1 oct2b)
+ n10 = (b2 oct2b)
+ n11 = (b3 oct2b)
+ n12 = (b4 oct2b)
+ n13 = (b5 oct2b)
+ n14 = (b6 oct2b)
+ n15 = (b7 oct2b)
+ n16 = (b8 oct2b)
+ n17 = (b1 oct3b)
+ n18 = (b2 oct3b)
+ n19 = (b3 oct3b)
+ n20 = (b4 oct3b)
+ n21 = (b5 oct3b)
+ n22 = (b6 oct3b)
+ n23 = (b7 oct3b)
+ n24 = (b8 oct3b)
+ n25 = (b1 oct4b)
+ n26 = (b2 oct4b)
+ n27 = (b3 oct4b)
+ n28 = (b4 oct4b)
+ n29 = (b5 oct4b)
+ n30 = (b6 oct4b)
+ n31 = (b7 oct4b)
+ n32 = (b8 oct4b)
+ oct1b = (octet1 addr2)
+ oct2b = (octet2 addr2)
+ oct3b = (octet3 addr2)
+ oct4b = (octet4 addr2)
+
+
+
+-- HUnit Tests
+mk_testaddr :: Int -> Int -> Int -> Int -> IPv4Address
+mk_testaddr a b c d =
+ IPv4Address oct1 oct2 oct3 oct4
+ where
+ oct1 = fromJust $ octet_from_int a
+ oct2 = fromJust $ octet_from_int b
+ oct3 = fromJust $ octet_from_int c
+ oct4 = fromJust $ octet_from_int d
+
+
+test_most_sig_bit_different1 :: Test
+test_most_sig_bit_different1 =
+ testCase desc $ assertEqual desc
+ TwentyFour
+ bit
+ where
+ desc = "10.1.1.0 and 10.1.0.0 differ in bit 24"
+ addr1 = mk_testaddr 10 1 1 0
+ addr2 = (mk_testaddr 10 1 0 0)
+ bit = most_sig_bit_different addr1 addr2
+
+
+
+test_most_sig_bit_different2 :: Test
+test_most_sig_bit_different2 =
+ testCase desc $ assertEqual desc
+ TwentyThree
+ bit
+ where
+ desc = "10.1.2.0 and 10.1.1.0 differ in bit 23"
+ addr1 = mk_testaddr 10 1 2 0
+ addr2 = mk_testaddr 10 1 1 0
+ bit = most_sig_bit_different addr1 addr2
+
+
+ipv4address_tests :: Test
+ipv4address_tests =
+ testGroup "IPv4 Address Tests" [
+ test_most_sig_bit_different1,
+ test_most_sig_bit_different2 ]